Mastering AppStorage in SwiftUI

Preface

In Apple's ecosystem of applications, developers more or less use UserDefaults. Personally, I prefer to save user-customizable configuration information (precision, units, colors, etc.) in UserDefaults. As the configuration information increases, the use of @AppStorage in SwiftUI views becomes more and more common.

In [Health Notes 3], I plan to provide users with more custom options, and the simple calculation is that there will be 40-50 items. In the configuration view, all the UserDefaults content used will be injected into the code.

This article discusses how to use @AppStorage elegantly, efficiently, and safely in SwiftUI, without relying on third-party libraries, to solve the pain points in current @AppStorage usage:

• Limited supported data types
• Tedious declaration
• Easy to have spelling mistakes in the declaration
• A large number of @AppStorage cannot be uniformly injected

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